Oh man, been there, that stuff is tough. I got it everywhere. I just set my ZTR as high as it’ll go and mow it like anything else. Of course if you don’t have a ZTR that’s not helpful, but if you do then each tree like that is about a 6 second job. I haven’t tried using a regular push mower but that might work too. I’ve cleared some really nasty stuff by sacrificing a cheap push mower.